If your iPhone or iPad was crashing all day Saturday, you’re not alone.

An iOS bug appeared to be triggered Saturday that caused iPhones to crash whenever they receive a notification, specifically one that was autogenerated from the app. For instance, a notification from a game that “We haven’t seen you in a while” would trigger the bug, while one saying “Bob liked your tweet” based on a specific action would not.

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ZDNet explains that when you receive those notifications the bug causes processor usage in your phone to spike to 100 percent. That in turn causes your device to heat up, which then causes it to reset. And it’s super annoying.